:root{--navy:#173b70;--navy-dark:#102d55;--orange:#f28a35;--ink:#1d2b3a;--muted:#718096;--line:#e6ebf2;--paper:#f5f7fb;--white:#fff;--green:#198754;--red:#c0392b;--shadow:0 10px 30px rgba(25,48,80,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:linear-gradient(145deg,#e8eef8,#f8fafc);color:var(--ink);font-family:Inter,"Segoe UI",Arial,sans-serif;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}button,input{font:inherit}button{cursor:pointer;transition:transform .15s,background .15s,border-color .15s}button:focus-visible,input:focus-visible{outline:3px solid #85b7f5;outline-offset:2px}button:disabled{cursor:default}.app-container{position:relative;width:100%;max-width:460px;height:min(880px,calc(100vh - 48px));min-height:560px;overflow-y:auto;background:var(--paper);border-radius:28px;box-shadow:0 24px 70px rgba(18,44,78,.22);padding:25px 22px 94px;scrollbar-width:thin}.screen{display:none}.screen.active{display:block;animation:fadeIn .22s ease}@keyframes fadeIn{from{opacity:.4;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}h1,h2,h3,h4,p{margin-top:0}h1{font-size:27px;line-height:1.2;margin-bottom:10px}h2{font-size:20px;margin-bottom:5px}h3{font-size:16px;margin-bottom:7px}p{line-height:1.5}.muted{color:var(--muted)}.small{font-size:12px;margin-bottom:0}.tiny{font-size:10px}.eyebrow{font-size:10px;letter-spacing:1.7px;font-weight:800;color:var(--navy);margin-bottom:8px}.auth-brand{text-align:center;padding:18px 8px 22px}.logo-circle{width:65px;height:65px;border-radius:21px;background:linear-gradient(135deg,var(--navy),#2c68a6);color:white;display:grid;place-items:center;font-size:26px;margin:0 auto 14px;box-shadow:0 10px 22px #173b7030}.auth-brand .eyebrow{margin-bottom:6px}.auth-brand .muted{font-size:13px;margin-bottom:0}.card{background:var(--white);border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:var(--shadow)}.auth-tabs{display:flex;background:#f0f3f8;border-radius:12px;padding:4px;margin-bottom:20px;gap:4px}.auth-tab{flex:1;border:0;border-radius:9px;padding:10px 5px;background:transparent;color:var(--muted);font-size:12px;font-weight:700}.auth-tab.active{background:white;color:var(--navy);box-shadow:0 2px 8px #142f5010}.auth-form label{display:block;font-size:12px;font-weight:700;margin:0 0 7px;color:#40516a}.auth-form input{width:100%;border:1px solid #dce3ed;border-radius:10px;padding:12px;margin-bottom:15px;background:#fbfcfe;color:var(--ink)}.auth-form input:focus{border-color:#6798d5;background:white}.primary-btn,.secondary-btn{width:100%;border:0;border-radius:11px;padding:12px 14px;font-size:13px;font-weight:750}.primary-btn{color:white;background:var(--navy);box-shadow:0 5px 12px #173b7020}.primary-btn:hover{background:var(--navy-dark);transform:translateY(-1px)}.secondary-btn{color:var(--navy);background:#edf3fb;border:1px solid #dce8f8}.auth-note{font-size:10px;line-height:1.55;color:#8490a0;margin:15px 2px 0}.message{font-size:12px;margin:10px 0 0}.message.error,.quiz-feedback.error{color:var(--red)}.message.success,.quiz-feedback.success{color:var(--green)}.app-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:19px}.app-header h2{margin:0}.app-header .eyebrow{margin-bottom:4px}.logout-btn{width:39px;height:39px;border-radius:12px;border:1px solid var(--line);background:white;color:var(--navy);flex:none}.hero-banner{position:relative;overflow:hidden;border-radius:19px;padding:21px 18px;margin-bottom:24px;background:linear-gradient(120deg,#173b70,#2f659d);color:white;min-height:148px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 10px 22px #173b7020}.hero-banner:after{content:"";position:absolute;width:180px;height:180px;border-radius:50%;right:-65px;bottom:-100px;background:#ffffff12}.hero-banner .eyebrow{color:#c9e0ff;font-size:9px;letter-spacing:1.3px}.hero-banner h2{font-size:23px;line-height:1.18;margin-bottom:8px}.hero-banner p:not(.eyebrow){font-size:11px;color:#e2edfa;margin:0;max-width:235px}.hero-icon{font-size:46px;filter:drop-shadow(0 4px 5px #0002);z-index:1}.level-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.level-heading h3{margin-bottom:3px}.level-buttons{display:flex;gap:8px;margin-bottom:19px}.level-btn{flex:1;padding:10px 0;border-radius:10px;background:white;border:1px solid #e0e6ef;color:#6d7b8d;font-size:13px;font-weight:800}.level-btn.active-level{background:var(--navy);color:white;border-color:var(--navy);box-shadow:0 5px 12px #173b7025}.progress-section{background:white;border:1px solid var(--line);border-radius:16px;padding:15px;margin-bottom:23px}.progress-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:13px}.progress-top .eyebrow,.progress-top p{margin-bottom:4px}.progress-top h3{font-size:20px;margin:0}.progress-icon{width:40px;height:40px;border-radius:13px;background:#eaf2ff;color:var(--navy);display:grid;place-items:center}.progress-track{height:7px;border-radius:9px;background:#eaf0f6;overflow:hidden}.progress-fill{height:100%;border-radius:9px;background:linear-gradient(90deg,#f28a35,#ffc26e);transition:width .25s}.progress-section .small{margin-top:8px}.section-title{margin:0 0 12px}.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.feature-card{min-width:0;text-align:left;border:1px solid var(--line);border-radius:16px;padding:15px 12px;background:white;box-shadow:0 4px 14px #173b7007;display:flex;flex-direction:column;align-items:flex-start;gap:5px;color:var(--ink)}.feature-card:hover{transform:translateY(-2px);border-color:#cad8eb}.feature-card strong{font-size:13px}.feature-card small{font-size:10px;color:var(--muted);line-height:1.4}.feature-icon{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;font-size:16px;margin-bottom:5px}.purple{background:#f0eaff;color:#7753c7}.blue{background:#e8f2ff;color:#3979bd}.green{background:#e2f7ed;color:#16885b}.orange{background:#fff0df;color:#c7741c}.red{background:#ffe9e7;color:#cb4e45}.gold{background:#fff5d6;color:#a47b13}.leaderboard-card{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:14px;margin-top:17px;background:#fff8e8;border:1px solid #f6e6be;border-radius:14px;font-size:11px}.leaderboard-card>div{display:flex;align-items:center;gap:10px}.leaderboard-card p{margin:4px 0 0}.leaderboard-card>strong{white-space:nowrap;color:#9a6913}.leader-icon{width:34px;height:34px;border-radius:11px;background:#ffedbd;color:#bd8515;display:grid;place-items:center;font-size:15px}.content-header{position:sticky;top:-25px;background:var(--paper);z-index:5;padding:8px 0 13px}.content-header h2{font-size:16px;flex:1}.back-btn{width:auto;border:0;background:transparent;color:var(--navy);padding:8px 0;font-size:11px;font-weight:700;white-space:nowrap}.level-chip{background:#e5eefb;color:var(--navy);font-size:10px;font-weight:800;border-radius:8px;padding:7px 9px}.content-body{padding-bottom:8px}.lesson-card,.content-intro{background:white;border:1px solid var(--line);border-radius:17px;padding:16px;margin-bottom:13px;box-shadow:0 4px 12px #173b7006}.lesson-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:11px}.lesson-tag{background:#edf4ff;color:#2a5e9b;border-radius:7px;padding:5px 8px;font-size:9px;font-weight:800}.lesson-number{font-size:9px;color:#9aa5b4;font-weight:800;letter-spacing:1px}.lesson-card h3{font-size:16px;margin-bottom:7px}.lesson-card>p,.content-intro p{font-size:12px;color:var(--muted);margin-bottom:13px}.example-box{background:#f7f9fc;border-radius:11px;padding:12px;margin-bottom:12px}.example-box>strong{font-size:10px;color:var(--navy);text-transform:uppercase;letter-spacing:.7px}.example-box p{font-size:13px;font-weight:650;margin:6px 0 8px}.text-audio-btn{background:transparent;border:0;color:#2e69a8;font-size:11px;font-weight:750;padding:3px 0}.lesson-vocab{margin:13px 0 0}.vocab-row{display:flex;justify-content:space-between;gap:12px;border-bottom:1px solid #edf0f5;padding:10px 0;font-size:11px}.vocab-row:last-child{border-bottom:0}.vocab-row strong{color:var(--navy)}.vocab-row span{text-align:right;color:var(--muted)}.vocab-card{display:flex;align-items:center;justify-content:space-between;gap:12px;background:white;border:1px solid var(--line);border-radius:13px;padding:12px 13px;margin-bottom:9px}.vocab-card strong{font-size:13px}.vocab-card p{font-size:11px;color:var(--muted);margin:4px 0 0}.round-audio{width:35px;height:35px;flex:none;border:0;border-radius:11px;background:#e8f2ff;color:var(--navy)}.french-phrase{font-size:15px!important;color:var(--navy)!important;font-weight:700}.resource-link{display:flex;justify-content:space-between;align-items:center;gap:10px;background:white;border:1px solid var(--line);border-radius:13px;padding:15px;margin-bottom:10px;color:var(--navy);font-size:12px;font-weight:750;text-decoration:none}.resource-link:hover{border-color:#9dbbe0}.quiz-progress{margin-bottom:17px}.quiz-progress .small{margin-top:8px}.quiz-card{background:white;border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:var(--shadow)}.quiz-card h3{font-size:19px;line-height:1.4;margin:8px 0 20px}.quiz-card .eyebrow{margin:0}.options{display:grid;gap:10px}.quiz-option{width:100%;display:flex;align-items:center;gap:11px;text-align:left;padding:12px;border:1px solid #e0e6ef;border-radius:12px;background:#fff;color:var(--ink);font-size:12px;line-height:1.4}.quiz-option:hover:not(:disabled){border-color:#9bb8de;background:#f8fbff}.option-letter{width:28px;height:28px;flex:none;border-radius:9px;display:grid;place-items:center;background:#f0f3f8;color:#5b6e84;font-size:11px;font-weight:800}.quiz-option.correct{background:#eaf8f0;border-color:#7ac79a}.quiz-option.correct .option-letter{background:#198754;color:white}.quiz-option.incorrect{background:#fff0ef;border-color:#e3a09b}.quiz-option.incorrect .option-letter{background:#c0392b;color:white}.quiz-feedback{font-size:12px;line-height:1.5;margin:14px 0}.quiz-card #next-btn{margin-top:12px}.result-medal{font-size:45px;text-align:center;margin:12px}.options>p{text-align:center;font-size:13px}.modal{display:none;position:fixed;inset:0;z-index:20;background:#0c1d32b8;align-items:center;justify-content:center;padding:18px}.modal.visible{display:flex}.modal-content{position:relative;width:100%;max-width:430px;max-height:90vh;overflow:auto;background:white;border-radius:20px;padding:20px}.close-btn{position:absolute;right:13px;top:8px;border:0;background:transparent;color:#536173;font-size:28px;width:34px;height:34px}.certificate-box{border:5px double #d5b15b;padding:24px 15px;text-align:center;margin:10px 0 18px;background:#fffdf7}.certificate-box .eyebrow{margin-top:5px}.certificate-box h2{font-size:20px;color:var(--navy);margin:15px 0}.certificate-box p{font-size:12px;color:#5d6878;margin:10px 0}.certificate-box h1{font-family:Georgia,serif;font-size:25px;color:#173b70;margin:17px 0}.cert-signature{border-top:1px solid #b8a16b;display:inline-block;padding-top:8px;margin-top:20px;font-size:11px;font-weight:800;color:var(--navy)}.bottom-nav{display:flex;position:absolute;bottom:0;left:0;right:0;background:#ffffffed;backdrop-filter:blur(12px);border-top:1px solid #e9edf3;padding:11px 7px 12px;justify-content:space-around;border-radius:0 0 28px 28px;z-index:8}.nav-item{background:transparent;border:0;color:#8994a3;display:flex;flex-direction:column;align-items:center;gap:5px;font-size:9px;font-weight:650;min-width:58px}.nav-item i{font-size:16px}.nav-item.active{color:var(--navy)}[hidden]{display:none!important}
@media(max-width:520px){body{padding:0;background:var(--paper);align-items:stretch}.app-container{max-width:none;width:100%;height:100dvh;min-height:0;border-radius:0;padding:20px 17px 88px;box-shadow:none}.bottom-nav{border-radius:0;padding-bottom:max(12px,env(safe-area-inset-bottom))}.content-header{top:-20px}.auth-brand{padding-top:30px}.hero-banner{padding:18px 15px}.hero-banner h2{font-size:21px}.hero-icon{font-size:39px}}
@media print{body{display:block;background:white;padding:0}.app-container{display:block;height:auto;min-height:0;max-width:none;padding:0;overflow:visible;box-shadow:none;background:white}.screen,.bottom-nav{display:none!important}#certificate-modal.visible{display:block!important;position:static;background:white;padding:0}#certificate-modal .modal-content{max-width:none;max-height:none;overflow:visible;border-radius:0;padding:0}#certificate-modal .close-btn,#certificate-modal .primary-btn{display:none!important}#certificate-print-area{margin:0 auto;width:100%;min-height:90vh;display:flex;flex-direction:column;justify-content:center;page-break-inside:avoid}.certificate-box{border-width:8px;padding:50px 25px}.certificate-box h1{font-size:36px}.certificate-box h2{font-size:27px}}